Memorial Day commemorates those men and women who have lost their lives during military service. Many people, particularly those who have lost a loved one, visit cemeteries and memorials. Flags are flown at half-mast. Today, Memorial Day means a day off of work and school for many, and it marks the start of summer. Therefore, many people spend the day with family and friends celebrating with summer activities such as picnics and barbecues. Many businesses have stores to encourage people to spend the day shopping.